Process of dyeing



Patented May 6, 1930 warren srArEs rnrenr t JAMES BADLFLEY, OE BLACKLEY, MANCHESTER, ENGLAND, ASSIGNOR TO BRITISH DYESTUFFS CORPORATION LIMITEDOF BLAGKLEY, MANCHESTER,'ENGLAND PROCESS OF DYEING No Brewing. Application filed May 26, 1927, Serial No. 194,542, and in Great Britain Ecptember 7, 1926.

Renewed September 24, 1929.

homologues, derivatives, and the sulphonic acids and carboxylic acids thereof, for in-' tance aryl amines having the general formula H N-R wherein R re resents a phenyl or naphthyl residue or the a l, nitro, chloro,

u sulphonic or carboxylic derivatives of such residue, with a EZ-amino-5-naphthol-7-sulphonic acid, including in this expression its N-substituted derivatives. Some of the} dyestuffs of this class are already known but they have never been used commercially, probably because they possess too small an aflinity for cotton. 1 havenow made the entirely unexpected discoverythat these dyestuiis possess a good affinity for regenerated cellulose silks and in particular that they give level dyeings on these fibres. It is now well known that the regenerated cellulose silks generally possess a very uneven avidity for the usual ,cotton colours, which causes the dyeings obtained to be unlevel. My discovery of a range of dyestuffs which give even dyeings on these fibres is therefore of considerable value to those engaged 'in the process of dyeing regenerated cellulose silks.

The regenerated cellulose silk materials are dyed in the usual way. The following description is typical of the manner in which the dyeing may be carried out, but it must be understood that these conditions may be varied considerably and that I do not limit myself to the conditions given in the example.

Ewample 'Z-sulphonic acid. 100 parts of the regenerated cellulose silk material are entered into the dyebath, which is then brought to the boil.

About parts of Glaubers salt or common salt are then added and dyeing allowed to pro ceed at or near the boil for half to three-quarters hours. if desired, soap may be added to the dyebath. The fabric is dyed a bright red shade, the dyeing being particularly level.

The following further examples illustrate the shades I obtain according to this invention, the dyeing being carried out in the usual way.

Monoazo dyestuti' from:-

$hede o ]:k viscose s1 igg fl ggg Second component B-naphthylamine 2- emino 5 naphthol 7- Scarlet sulphonic acid 2 naphthylemine 6 sul- 2 amino 5 naphthol 7 Scarlet phonic acid sulphonic acid p-chloroaniline 2 ethylamino 5 naph- Scarlet thol 7 sulphonic acid Aniline 2 phenylnmino 5 naph- Scarlet thol 7 sulphonic acid o-anisidine 2 phenylamino 5 naph- Scarlet thol 7 sulphonic acid paminoaceteniiide (the 2 phenylarnino 5; naph- Violet acetyl group being hythol 7 sulphonic acid drolyzed after coupling) Dehydrothio p tolui 2-phenylarnino-5 naph- Crimson dinesulphonic acid thol 7 sulphonic acid o-anisidine 2 p tolylnmino 5 naph- Red thol-7-sulphonic acid p-chloroaniline 2 o anlsylnmino 5 Red naphthol 7 sulphonic acid p-chloroaniline 5 hydroxy 2:2 dinaph- Red thylamine -7 sulphonic acid 2 chloro 4 amino l s 5 hydrony 2:2 dinaph- Bluish-red methylbenzene 5 sulthylemine- 7- sulphonic phonic acid acid Aniline 2 benzoylarnino 5 Orange naphthol 7 sulphonic acid fl-naphthyIamine 2 benzoylaminn 5 Red naphthol 7 suiphonic acid p-nitroeniline 2 benzoylamino 5 Orange naphthol 7 sulphonic I acid m-aminobenzoic acid 2 benzoylaniino 5 Orange naphthol 7 sulphonic acid 2 na hthylamine 6:8 2 benzoylamino 5 Pink disu phonic acid naphthol 7 sulphonic acid p-chlotoaniline 2 henzoylamino 5 Orange I naphthol 7 sulphonic acid.

Aniline 5 hydroxy 2 napth- Orange tliylglycine 7 sulphonic acid acid is then precipitated as white or greyish substance by acidifying the filtrate.

What I claim and desire to secure by'Letters Patent is 1. The process of dyeing regenerated cellulose material in level shades characterized by the application to the material of monoazo Q tol lamino-5-naphthol-7-sulphonic acid with a iazo compound.

2. The process of dyeing regenerated cellulose material in level shades characterized by azo dyestufi's obtained by coupling a sulphoture som NHR The 1 5-hydyestufis obtained by coupling a 2-para-- the application to the said material of mononated amino naphthol of the following strucphenyl or na hthyl residue or the alkyl, nitro, chloro, sulpii derivatives of such residue. I

5. Regenerated cellulose materials dyed in level shades by the application to the material of monoazo dyestuffs obtained by coupling a sulphonated amino naphthol of the following structure som- NHR H wherein R represents hydrogen, an alkyl or acyl group, or a phenyl or. naphthyl residue, with a diazotized aryl aminehaving the formula H N-R wherein R represents a phenyl or'naphthyl residue or the alkyl, nitro, chloro, sulphonic or carboxylic substituted derivatives of such residue.

In testimony whereof I afiix my signature. JAMES. BADDILEY.

where R- represents hydrogen, an alkyl or 1 acyl group, or a phenyl or naphthyl residue,

with a diazo compound.

K3. Regenerated cellulose materials dyed in level shades by the application to the material of monoazo dyestuffs obtained b coupling a 4 sulphonated amino naphthol of t e following structure 7 801K um:

where R represents hydro en, an alkyl or acyl group, or a phenyl or nap thyl residue, with a diazo compound.

s 4. The process of dyeingregenerated cellulose material in level shades characterized by the application to the said material of monoazo dyestufis obtained by coupling a sulphonated amino naphthol of the following structure 50.11 NHB' wherein R represents hydrogen, an alkyl or acyl group, or'a phenyl or napthyl residue, with a diazotized arylamine having the I 05 ,formula H N-R wherein R represent a onic or carboxylic substituted I 

